Section 03
ENGINE
Subsection 02
(TROUBLESHOOTING)
03-02-6
VMR2004_125_03_02A.FM
CYLINDER AND HEAD
SYMPTOM
UNUSUAL ENGINE NOISE AND/OR VIBRATION IN IDLE SPEED.
CONDITION
NORMAL USE.
Test/Inspection
1. Check operation of decompressor located on camshaft.
a. Decompressor shaft stucks and/or torsion spring is damaged.
Replace spring and/or decompressor mechanism.
b.
Loose camshaft gear.
Retighten camshaft gear (refer to CYLINDER AND HEAD).
2. Check chain tensioner operation.
a. Faulty chain tensioner.
Replace spring and/or mechanism.
3. Check valve adjustment.
a. Intake and/or exhaust valves not adjusted correctly.
Adjust valves.
SYMPTOM
UNUSUAL ENGINE NOISE AND/OR VIBRATION WHILE OPERATING.
CONDITION
NORMAL USE.
Test/Inspection
1. Check items 1 and 2 of UNUSUAL ENGINE NOISE AND/OR VIBRATION IN IDLE
SPEED.
2. Check noise coming from cylinder head area.
a. Check valve clearance.
Readjust valve clearance and/or replace defective part(s).
b. Chain guide worn out.
Replace chain guide.
c. Stretched chain and/or worn out sprocket.
Replace chain and sprocket at the same time.
d. Sprocket screw got loose.
Retighten screw with recommended torque.
e. Rocker arm(s) is (are) worn out (valve adjustment).
Readjust valve clearance and/or replace rocker arm(s).
f. Thrust washer(s) on rocker arm shaft is (are) missing.
Fit thrust washer(s) (refer to CYLINDER AND HEAD).
SYMPTOM
OIL CONTAMINATION ON CYLINDER AND/OR HEAD.
CONDITION
NORMAL USE.
Test/Inspection
1. Check screws for torque.
a. Loose screws.
Retighten screws with recommended torque.
b. Gaskets are brittle, hard, worn out or damaged.
Replace damaged gasket(s).
Содержание M-50 x 4
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